Honeywell FMZ Series Pilot's Manual page 222

Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
Step Procedure 6- -8 FMS Manual Position Update by
1 Select POS SENSORS from the NAV INDEX.
2 Before reaching ZUN, select the UPDATE prompt (1R), as
shown in Figure 6--50.
Navigation
6-64
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Flyover
Figure 6- -50
POS SENSORS UPDATE
A28- - 1146- - 181
REV 3 Mar 2009